A novel position detector based on nanotechnologies: the NanoChanT project.

As an application of nanotechnologies, we have proposed a novel type of radiation detector with an ordered array of carbon nanotubes (CNs) placed between an active medium and the read-out electronics. The charge produced in the active medium, when it is crossed by a particle, is driven via the CNTs to the read-out electronics. Multi-wall CNs, having diameter in the range 10 – 100 nm and metal electrical properties, will enable a sub-micron spatial resolution. CNs highly uniform in size and spacing and electrically insulated from each other are required for the optimization of charge collection. A layer of porous alumina acts as mechanical framework, with suitable dielectric properties, for the growth of the conductive array of CNs. Porous alumina foils of hundred square millimiters area, formed by anodic oxidation of aluminium, have been fabricated. A highly ordered array of parallel nanochannels with size and pitch in the range 10 – 200 nm and 40 – 400 nm, respectively, has been obtained for alumina thicknesses up to 100 microns. Cobalt particles are then electrodeposited at the bottom of the alumina nanochannels in order to act as catalyst for the growth of CNs. We are presently tuning the process of synthesis of CNs via chemical vapour deposition of hydrocarbons.